Pull-switch socket



June 8 1926. 1,587,837

C. L. HOPKINS PULL SWITCH socxET Filed Sept- 7. 1920 2 sheets-sheet 1 ZI Z5 2` June 8 1926.

c. l... HOPKINS PULL SWITCH SOCKETl Filed Sept. 7, 1920 '"1"' lm." E

2 Sheets-Sheet 2 Patented .lune il,

CHARLES;Il.,v HOBKINS, F 'RVEB FOREST, -NQISn netten ILLlNOIS.-

PULL-,sentori socrrn'r.

Application filed September 7, 192D. Serial No. 408,531.`

My invention relates to electrical connec tor devices endvmore Specilically to pull switch sockets.

One ot the objects of' my invention is to proyidean improved pull switch mecha- Fig'. 2 is a section onthe line 2-2 of Fig; y1;

Fia-3. is a section on the line of Fie. 4;;

Fig. 4 is a section on the lineA 4"-4 of Fig, 1 ;V

Fig.,r Lmisa section, on the line. 5 5' of Fig. 2;

Fig. Gilsl a section on*V the ,line 6,-6 of Fl- 251 l Fig. Tis a detail sectional View of gartv of the Switch Fig. S'Aisla'detailperspective View of part 0f the Switch 5 Eig: 9j is adetail`- perspective View oitjthe Snitch. anni. 0.1i blade.;`

liigf 110,iswecticn,Ontheline 'lOl-10 el Fi 2.; and.;

Flieg 1l.; is, al. deteilfl View 0i part 0f the switch;

The constructionr shown inu the4 drawing; comprises, ina. generalwy, a. Dull' Switch angle socket haying, ay threaded, shell contact 10,4`a center Contact 11,4 wiring' terminale 12 andi i3' for the. Contacte@ and lil renew tively, switchmechanism 14 'for controlling; thelcflrcnitlhetween the centen Contact 11 and Wiring, tenniial. 135e Substantially Cylindricalinsulating bese 1 5.. supnortingtlie. 0,11- nietall)v llitllewirne terminale@ and 13,1'switcllwrneclleniii llanrl. e Sheet, metal Sheller Gesine' lurienvdine `the insulating basel@ and the:A threaded` shell' Contact 10. Anlinenlagtingqfilore liningY or cup 17 is providedjust `ii'lsidei the casing` 1 6,l for,l insulating the threaded shellContactV lrointhe sheet. inclini Casina Ther threaded shell contact 1Q; ifs always electrically connected withhthewiring terminal hy meane ofa screw 1.8 (Figs. 1 and 3), which extends through anyopeningin the ila-nge 1() ofthe threadedjshellContact, and is threaded' into the binding plate, 2O of the Yirinp; terminal 12, the screw 18 thus not only eervingto electrically connect the Shell contact with the binding. platehnt tohold the parte in position on the insulating; base l5.

The Switch,mechanism 11i controls the, cir `cuit betnf'een two spring Contact ngers 21 and (Figs. 1j ande), theepring contact linger 21 being always. electricallg/ connected with the; wiring' te'iflninaljl and the spring Contact being always,` electricallly cennected with the center Contact 11. This electrical connectionbetween the spring contact 2l andthe bindingl terminal 13 iselectedloy means cii a. metal. stamping' 23l which' may have a" pert which 'forms the binding` plate for the wiring terminal 13. The electrical connection between the center contact-11, and the switch contact; 22 is el'ectedvhymeanso'f a metal cyelet 2 4'whieh extends through and is, riveted'` oyen the hagen portiQIl. of; the Spring Contact' 22H and centerA contact 11, that notf only electrically connects these parts, but serveeto ,holdjtheminplace on the ineulettingV base 15. The springs contact linger 21 AVancl" the stamping 2 3 are securedin place onthe insulating bane 1 5 and held'. in electrical engagementn with each otherv by ineansof al'ecrew 25 (Figs, 1 and' l), which @Xieiilehrmieli registering viieiliiiein ill@ neiiletiiiei bese l5 andthe. been Ot the Serine contact linger 21, and is threadedinto' the vhase of the metal stamning;

The: switch mechanism .111; which controls the circuit between thespning contact fingers 2 1' and 22 andbetween; the wiring terminal 13 and the center contact 11 comprisesa piv! oted oscilla-table switch blade or -arm,2$ monntedon a Vgivot piny 27, acoil compressionspring28 loeeringon 'the yswitchlolarde 2,6,

and; movable. past a, (leed, @enter line, to cause the ewitcharm 26to oscillateback and forth, a spring snpporting andjehitting; linkl 29 surrounded byI the spring 28, andI havinga eliding engagement with the Switch blade 2 6, an oscillatable supporting link, 31 pivoted onthe pivot pinyl' and having a; pivotal en,- gagement 82 with the springshiting link 29 cemvcranlt 3,3, operating ina slot 34a of the spring shittingv member 2 9 for swinging the.. spring Shifting" member beck and torti 'a pull chain 35, a ewiteh lever 36 towhich the chain 35 is secured, and ratchet mechanism 37 whereby the oscillating movement of the switch lever 36 causes a rotary step-bystep movement of the cam 33, and a switch frame 38 for supporting the various parts of the switch mechanism.

The switch blade 26 may be formed of an integral sheet metal stamping having a pair of contact portions 39 for engaging the contacts 21 and 22 respectively, for electrically connecting the contacts and having a bearing portion 4() provided with openings for the pivot pin 27. The switch blade is widened at 41 to assist in keeping .the switch parts assembled as will appear more clearly hereinafter. The spring shifting member 29 may be formed as a single integral sheet metal stamping having a ournal portion 42 for engaging an opening in the supporting member 31, whereby the members 29 and 3l are pivo-tally connected together. The supporting member 31 is prevented from slipping otl' from the journal portion 32 by means of the wide portion 41 of the switci blade 26 hereinbefore referred to. The supporting link 31 may be al sheet metal stamping, forked at one end to straddle the pivot pin 27. The cam crank 33 which operates in the slot 34 comprises a piece of bent wire 43, a cup-shaped'sheet metal stamping 44 forming a journal portion, and a sheet metal stamping 45 which forms a retaining and positioning member for the axial portion of the bent wire 43. This cup-shaped journal 44 is rotatably mounted in a sheet metal bearing bracket 46 (Figs. 2, 5 and 10) this bearing bracket also serving to support the pivot pin 27 on which the switch blade 26 and swinging link 31 are mounted. The crank pin portion 27 of the crank 33 extends through an opening in the cup-shaped journal member 44, whereby the crank pin is definitely positioned in this journal member. The journal member 44 and positioning member 45 are secured together b rivetin(r o tu as indicated at 48 in Fig. 7.

The switch lever 36 comprises a sheet metal chain rail 49 to which the ull chain 35 is secured, andan oscillatable insulating libre disc 50 to which the chain rail 49 is secured. This oscillatable disc 50 is mounted on the central axial portion of the bent wire shaft 43. The chain rail 49 is secured to this oscillatable disc 50 byv bending integral lugs 51 over into corresponding recesses in the fibre disc 50. For returning the switch lever 36 after it has been actuated by the pull chain, a coil torsion spring 52 is provided one end of which is connected to the switch frame 38 as indicated at 53 and the other end of which is connected to the oscillatable disc 50, as indicated at 53.

The ratchet mechanism 37 whereby the oscillatable movement ofthe switch lever 36 causes rotary step-by-step movement of the cam crank 33, comprises a pair of ratchetteeth 54 struck up from the sheet metal stamping 45 (Figs. 2 and 6), these ratchet teeth 54 engaging in corresponding ratchet depressions 55, formed in the side face of the insulating disc 50. y

The bracket 46 is secured to the main switch frame by means of a rivet 56 (Fig. 2) and the main switch frame 38 is secured in a recess 57 of the insulating base by means of a screw 58 threaded into the base of the switch frame.

As shown in Figs. 8, 10, and 11, the slot 34 in which the crank pin portion 47 of the cam crank 33 operates is slightly angular to provide for an even pull on the pull chain Each actuation of the pull chain 35 moves the crank portion 27 to a movement of 180 degrees, through the ratchet mechanism 37, this movement of the crank pin 47 moving the spring shifting member 29 from one extreme position to the other, causing the oscillation of the switch arm 26 to make or break the electrical connection between the spring Contact fingers 21 and 22. The rotation of the crank pin 47y is as indicated by the arrow A in Fig. 11.

W'hile I have shown but one embodiment of my invention, it may be embodied in other forms covered and defined by the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States 1. A switch mechanism comprising a pivoted switch blade oscillatable back and forth, a spring bearing on said switchblade, a spring shifting member for shifting said spring' back and forth past a Vdead center line to .cause oscillation of said switch blade, a supporting member mounted on a fixed pivot andhaving a pivotal connection with said pivoted supporting member, said spring .shifting member having a slot therein, and means to oscillate said spring shifting member comprising a cam crank having a crank pin operating in said slot.

2. A switch mechanism comprising a pivoted switch blade oscillatable back and forth,

a spring bearing on said switch blade, a

swinging spring shifting member for shifting said spring back and forth past a dead center line to cause oscillation of said switch blade, a supporting member mounted on a liXed pivot and having a pivotal connection with said spring shifting member, means for operating said spring shifting member comprising a crank shaft having a crank pin engaging said spring shifting member, and means for operating said crank pin comprising an oscillatable member mounted on said crank shaft.

3. A switch mechanism comprising a pivoted switch blade oscillatable back and forth, a springl bearing on said switch blade, a

.swinging spring shifting member for shifting said spring back and forth past a dead center line to cause oscillation of said switch blade, a supporting member mounted on a fixed pivot and having a pivotal connection with said spring shifting member, and means for operating said spring shifting member comprising a crank shaft having a crank pin engaging said spring shifting member, and means for operating said crank pin comprising an oscillatable member mounted on said crank shaft, and ratchet transmission mechanism between said oscillatable member and crank pin.

4. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a spring bearing on said switch blade, a swinging spring shifting member for shifting said spring back and forth past a dead center line, to cause oscillation of Said switch blade, said spring shifting member having an angular sloty therein, and means for controlling and operating said spring shifting member comprising a crank shaft having a pin operating in said angular slot.

5. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a spring bearing' on said switch blade, a swinging spring shifting member, for shifting said spring back and forth past a dead center line, to cause oscillation of said switch blade, a supporting member, mounted on a fixed pivot and having a pivotal connectionwith said spring shifting member and means for operating said spring shifting member to cause said switch blade to oscillate, comprising a ratchet, said supporting member and switch blade being coaxially mounted.

6. A switch, comprisinga pivoted switch blade, oscillatable back and forth, a spring bearing on said switch blade, a spring shifting member, oscillatable back and forth to move said spring past a dead center line to cause the switch blade to oscillate back and -forth, said spring shifting member being formed of sheet material and having a tongue struck up therefrom leaving a longitudinally extending slot, a journal portion formed integral with said tongue, a crank pin, operating in said slot and a supporting link pivoted to said journal portion.

In witness whereof, I have hereunto subscribed my name.

CHARLES L. HDPKINS. 

